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4 years ago

Which property do metalloids share with nonmetals

2 answers:

8 0

If your choices are :
Both are brittle.
Both are shiny.
Both have low melting points.
Both are very conductive

Then the answer is Both are brittle.

Naya [18.7K]4 years ago

6 0

Answer: b. both can react to form acidic compounds.

Explanation: bc nonmetals can form acidic compounds and metalloids have both properties of nonmetals and metals.

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A low orbit satellite at 100 km altitude had a camera that resolved a car location to within 0.3 meter. Find the minimum diamete

NeX [460]

Answer:

Minimum diameter of the camera lens is 22.4 cm

The focal length of the camera's lens is 300cm

Explanation:

y = Resolve distance = 0.3 m

h = Height of satellite = 100 km

λ = Wavelength = 550 nm

Angular resolution

$tan\theta\approx \theta =\frac{y}{h}\\\Rightarrow \theta=\frac{0.3}{100\times 10^3}=3\times 10^{-6}$

From Rayleigh criteria

$sin\theta=1.22\frac{\lambda}{D}\\\Rightarrow D=1.22\frac{\lambda}{sin\theta}\\\Rightarrow D=1.22\frac{550\times 10^{-9}}{sin3\times 10^{-6}}=0.2236\ m=22.4\ cm$

Minimum diameter of the camera lens is 22.4 cm

Relation between resolvable feature, focal length and angular resolution

$d=f\Delta \theta\\\Rightarrow f=\frac{d}{\Delta \theta}\\\Rightarrow f=\frac{9\times 10^{-6}}{3\times 10^{-6}}=3\ m=300\ cm$

The focal length of the camera's lens is 300cm

3 0

3 years ago

Why sky appear blue

NikAS [45]

Thus, as sunlight of all colors passes through air, the blue part causes charged particles to oscillate faster than does the red part. ... More of the sunlight entering the atmosphere is blue than violet, however, and our eyes are somewhat more sensitive to blue light than to violet light, so the sky appears blue.Apr 7, 2003

5 0

3 years ago

During the first 5 seconds after a ball is dropped from rest, how far will it fall?

agasfer [191]

The answer is 125metre

5 0

3 years ago

The temperature of an object is a measure of the average potential energy of the molecules in the object.

pav-90 [236]

Answer:

false

Explanation:

the temperature of an object is a measure of the average KINETIC ENERGY of the molecules in the object (not potential energy)

3 0

3 years ago

Coherent light with wavelength 608 nm passes through two very narrow slits, and the interference pattern is observed on a screen

Kipish [7]

Answer:

$1.22 \mu m$

Explanation:

In the double-slit interference, light passes through a double slit and produce a pattern of alternating bright and dark fringes on a distant screen. This pattern is due to the combined effect of the diffraction of each slit + the interference of the light coming from the two slits.

The condition to observe a maximum (bright fringe), so costructive interference, in the distant screen, is:

$y=\frac{m\lambda D}{d}$